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Acta Cryst. (2006). E62, i58-i60 [ doi:10.1107/S1600536806005514 ]
Abstract: Dipotassium hexaaquairon(II) bis(sulfate), K2[Fe(H2O)6](SO4)2, is a member of the isotypic series of Tutton salts with general formula MI2[MII(H2O)6](XO4)2, where X = S, Se or Cr. The structure contains centrosymmetric Fe(H2O)6 octahedra, with an average Fe-O distance of 2.14 (4) Å. Each octahedron is surrounded by isolated SO4 tetrahedra [average S-O distance = 1.483 (15) Å] and distorted KO6(H2O)2 polyhedra with an average K-O distance of 2.96 (15) Å. The polyhedra are linked via common O atoms and a system of medium-strength hydrogen bonds.
Online 22 February 2006
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